Nitrogen and sulfur co-doped biocarbon/SnO2/SnS/S composite material, preparation method and application

A composite material and bio-carbon technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of composite structure damage, failure to alleviate volume expansion, capacity loss, etc., to prevent oxidation, improve capture, and improve utilization Effect

Pending Publication Date: 2022-07-08
XIAN AERONAUTICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the combination of SnS and carbon cannot alleviate the volume expansion caused by SnS lithiation and polysulfide conversion, resulting in the destruction of the composite structure and capacity loss during cycling.

Method used

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  • Nitrogen and sulfur co-doped biocarbon/SnO2/SnS/S composite material, preparation method and application
  • Nitrogen and sulfur co-doped biocarbon/SnO2/SnS/S composite material, preparation method and application
  • Nitrogen and sulfur co-doped biocarbon/SnO2/SnS/S composite material, preparation method and application

Examples

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preparation example Construction

[0032] Nitrogen and sulfur co-doped biocarbon / SnO 2 The preparation method of / SnS / S composite material comprises the following steps:

[0033] Step 1: After grinding the dried tubular structure biomass, transfer to a low temperature tube furnace, in N 2 Under the atmosphere, the temperature is raised to 500°C to 600°C at a heating rate of 20°C / min to 30°C / min, maintained for 5min to 10min, and naturally cooled to room temperature to obtain biochar.

[0034] Wherein, the tubular structure biomass includes one or more of green onion, Spirogyra, water hyacinth, hyacinth moss, water moss, Jieji grass, and water peanut. When the tubular structure biomass is a mixture, any three of the above-mentioned tubular structure biomass are preferably mixed in a mass ratio of (1-3):(2-4):(3-6).

[0035]In this step, biomass with a slender tube structure is used as the carbon source, which has abundant reserves and wide sources. Using it as the carbon source effectively improves the utiliza...

Embodiment 1

[0061] Nitrogen and sulfur co-doped biocarbon / SnO 2 The preparation method of / SnS / S composite material comprises the following steps:

[0062] (1) Take 6.0g of dry water hyacinth in a mortar, grind for two minutes, put it into a white alumina porcelain boat, and heat up from room temperature to 500°C at a heating rate of 20°C / min in a low-temperature tube furnace. Incubate for 5 min under nitrogen protection to obtain biochar.

[0063] (2) 50 mL of a mixed solution of citric acid and tartaric acid with a molar ratio of 8 mol / L of 0.4:0.7 was added to the beaker, stirred uniformly, placed in a hydrothermal reactor after being placed for 10 min, and uniformly reacted at 160 ° C for 3 h to obtain Mixed acid solution.

[0064](3) Take 4g of biochar and put it in 10mL of mixed acid solution, stir the mixed acid solution evenly by hand for 20s and leave it for 0.5h, then put it in a tube furnace at 150℃ for 8h and take it out to get a mixed solution After the resulting mixed sol...

Embodiment 2

[0070] Nitrogen and sulfur co-doped biocarbon / SnO 2 The preparation method of / SnS / S composite material comprises the following steps:

[0071] (1) Take 6.0g of dry green onion and put it in a mortar, grind it for 3 minutes, put it into a white alumina porcelain boat, and heat it up from room temperature to 520°C at a temperature rise rate of 22°C / min in a low temperature tube furnace. Incubate for 7 min to obtain biochar.

[0072] (2) Add 45mL of a mixed solution of citric acid and tartaric acid with a molar ratio of 8.5moL / L of 0.2:0.5 into the beaker, stir evenly, place it for 15min and place it in a hydrothermal reactor, and react uniformly at 165°C for 3.5h , to obtain a mixed acid solution.

[0073] (3) Take 4.4g of biochar and put it in 12mL of mixed acid solution, stir the solution by hand for 20s and then leave it for 1h, then put it in a tube furnace at 165°C for 10h of uniform reaction, and then take it out to obtain a mixed solution, After the obtained mixed sol...

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Abstract

The invention discloses a nitrogen and sulfur co-doped biochar / SnO2 / SnS / S composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: performing heat treatment on biomass with a tubular structure to obtain biochar; carrying out solvothermal reaction on the biochar by taking mixed acid as a solvent; adding acid liquor into the obtained product, and carrying out solvothermal reaction to obtain biological carbon rich in oxygen-containing functional groups; mixing the nitrogen-sulfur co-doped biochar with thiourea, and carrying out heat treatment in a mixed atmosphere of NH3 and H2S to obtain nitrogen-sulfur co-doped biochar; mixing with an inorganic tin source, and carrying out hydrothermal reaction to obtain a nitrogen and sulfur co-doped biochar / SnO2 composite material; and mixing with thiourea, and carrying out heat treatment to obtain a final product. According to the invention, the rapid adsorption and conversion capability on polysulfide is realized, the capacity of the lithium-sulfur battery is improved, meanwhile, the stability of the composite structure in the circulation process is ensured, and the capacity loss caused by structural damage is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery electrodes, in particular to nitrogen and sulfur co-doping biological carbon / SnO 2 / SnS / S composite material, preparation method and application. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Due to the high energy density, good safety performance and environmental friendliness, lithium-ion batteries have been widely used in people's production and life, and become one of the most interesting electrochemical energy storage devices in the future. In particular, with the substantial increase in market demand for electric vehicles and portable electronic devices in recent years, higher requirements have been placed on the fast and high-capacity storage of lithium batteries. Graphite is used as the negative electrode of lithium-ion battery, and i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/58H01M4/583H01M10/052
CPCH01M4/362H01M4/38H01M4/583H01M4/483H01M4/5815H01M10/052H01M2004/027Y02E60/10
Inventor 王彩薇张晶
Owner XIAN AERONAUTICAL UNIV
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